Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
A CIRCLE WITHOUT A COMPASS
The sister with the cutting it took to draw a circle the diameter of which more than allows a compass. Rescued... a school ruler, which my dad drilled hole (see figure). The first of...
DUMP TRAILER
Trailers for passenger cars that turn them into small trucks are especially popular among rural residents and owners of country houses. And that’s quite natural — they make it much easier...
